Anthraquinone pigments

ABSTRACT

Compounds of the formula   WHEREIN R is methyl, methoxy or chlorine.   WHEREIN R is methyl, methoxy or chlorine.

United States Patent 191 Pugin et al.

[11] 3,741,995 1*June 26, 1973 ANTHRAQUINONE PIGMENTS Inventors: Andre Pugin, Riehen/Basle; Kurt Burdeska; Ernst Model, both of Basle, all of Switzerland Assignee: Ciba-Geigy AG, Basel, Switzerland Notice: The portion of the term of thispatent subsequent to Oct. 31, 1989, has been disclairned.

Filed: Mar. 17, 1971 App]. No.: 125,394

Foreign Application Priority Data Apr. 3, 1970 Switzerland 4934/70 References Cited UNITED STATES PATENTS 5/1936 Krzckalla et al 260/377 2,833,789 5/1958 Grambalvo 260/377 Primary ExaminerLorraine A. Weinberger Assistant Examiner-E. Jane Skelly Attorney-Wenderoth, Lind & Ponack ABSTRACT Compounds of the formula OH Br R C ONH Br H wherein R is methyl, methoxy or chlorine.

4 Claims, No Drawings are not good, so that the use of such pigments in lacquers and synthetic materials is extremely limited.

In co-pending applicationSer. No. 858,126, now

US. Pat. No. 3,701,791, pigments are described of the compounds of formula I: a

wherein at least 2 of the symbols X,, X X and X stand for an acylamino group, of which groups at least 2 represent a salicyclic acid amide group of formula ll:

I Ni I R2 (II) wherein e R, denotes hydrogen, chlorine, bromine, the methyl, hydroxyl, methoxy, cyano, or phenyl group, or an alkylsulphonyl group having 1 4 carbon atoms,

and R denotes hydrogen, chlorine, bromine or the methyl group, and'wher ein of thesymbols X,,-,-.X,, at most 4 stand for chlorine or bromine, at most 2 stand for the methyl, cy-v ano, methoxy or ethoxy group, and the remainder stand for hydrogen. I

Thesepigments have'not'only fa'stness'to light, but to a high degree also fastness to migration and to cross lacquering, as well as to solvents and, in particular, also 2-hydmay-3,5-dibromo-4-chloro-l benzoic acid.

to weather, even in lacquers containing aluminium (III) wherein R represents the methyl group, the methoxy group, '65

or chlorine, constitute pigments having similarly good properties.

These compounds are produced according to the invention by condensing l,5-diaminoanthraquinone with a compound introducing the salicoyl group of formula W5 'I-IO Br 0 l I ll -11 Br (IV) wherein R represents the methyl group, the methoxy group,

or chlorine.

Suitable compounds releasing the salicylic acid radical of formula IV are the corresponding salicylic acids or salicylic acid halides. The condensation is advantageously performed in an inert, high-boiling organic solvent such I as chlorobenzene, nitrobenzene, o-

'dichlorobenzene or trichlorobenzene, in the presence or absence of condensation agents, optionally by heating with acid-binding agents suchaspyridine, quinoline, or sodium acetate. n

Starting products for the productio'n o'f pigments according to the invention are, in addition to 1,5-

diaminoanthra quinone,the following salicylicacid derivatives: I n A 2-hydroxy-3,5-dibr0mo-4-me,thyl l benzoic acid, "2-hydroxy 3,5-dibrorho-4-rriethoxy-l-benzoic acid,

The pigments according to the invention possess'a good texture, and can be frequently used in the form of their crude product. If necessary'or desired, the crude productsm'ay be converted into a finely dispersed form by grinding or kneading. 'Advantageously, grindingaux'iliaries are thereby used, such as inorganic and/or organic salts, in the presence or absence or organic solvents. lt is possible to obtain an improvement of the properties also by heating the crude pigments in hot organic solvents. After grinding has been performed, the

auxiliaries are removed in the usual manner; soluble'inorgani'c salts are removed, for example, with water and organic auxiliaries volatile in steam, e.g. by steam distillation A deeply coloured, finely dispersed pigment can also be obtained by dissolving and reprecipitating from sulphuric acid. i i

The pigments according to the invention are suitable for the pigmenting of high-molecular organic material, and possess the already mentioned good fastness properties. The said pigments are used in poster printing and tin-plate printing, in printing inks for the printing industry, in paints with an oil base, such as linseed oil paints, or with a water base. such as dispersion paints, or in lacquers ofvarious kinds, such as nitrolacquers or stoving lacquers, in the last-mentioned case, for example, lacquers with an alkyd resin base. Furthermore, the

said pigments can be used for the spinning-dyeing of viscose .or of cellulose acetate, for the pigmenting of synthetic materials such as polyethylene, polystyrene,

polyvinyl chloride (whereby the last-named may also contain softeners), cellulose esters, thermosetting resins, or for the pigmenting of rubber, as well as for pa- I per-pulp dyeing, or for the coating of webs, e.g. the

coating of laminated paper.

The temperatures are given in degrees Centigrade in the following example.

EXAMPLE 1 llr r NlI-CO Br O CEIHY HiC I. Dr

7.2 g. of 1,5-diaminoanthraquinone and 21.4 g. of 2- hydroxy-3,5-dibromo-4-methyll -benzoic I acid are heated with 250 ml. of l,2,4-trichlorobenzene to 105 Thus obtained are 20 g. of a yellow product which yields,- after salt-grinding, a reddish yellow pigment having very good fastness to light, weather, crosslacquering, and migration.

It, with otherwise the same procedure, the 21.4 g. of 2hydroxy-3,5-dibromo-4-methyl-l-benzoic acid are replaced by 22.8 g. of 2-hydroxy-3,5-dibromo-4- chloro-l-benzoic acid, or by 2-hydroxy-3,5-dibromo-4- methoxy-l-benzoic acid, then a yellow pigment is obtained having similar fastness properties:

The pigments produced according to the preceding example are used as follows:

a Two parts of a pigment produced according to'the example are mixed and triturated on a three-roller mill together with 36 parts of aluminium hydroxide, 60 parts of linseed-oil varnish of medium viscosity, and 0.2 parts of cobalt linoleate. In this manner is obtained an ink for printing purposes, with which are produced reddish yellow printings 'of high purity, high colour 4 strength, and, having very; good fastness to light.

b Two parts of a pigment producedsaccording to the example are ground in a ball-mill for 48 hours together with l0 parts of titanium dioxide, 35 parts of a perc'ent solution of a modified urea-alkyd resin in a mixture of xylene and butanol in the reciprocal ratio of l 1, 10 parts of oil of turpentine and 5 parts of xylene.

If this dyed lacquer is applied to aluminium sheets and then fixed by stoving for 1 hour at then a pure yellow dyeing is obtained having very good fastness to cross-lacquering, to light and to weather.

c. Sixty-seven parts of polyvinyl chloride, 33 parts of dioctylphthalate, 2 parts'of dibutyl tin dilaurate, 0.6 parts of a pigment produced according to the example, and 2 parts of titanium dioxide are mixed together, and rolled for 10 15 minutes at Thus obtained are reddish yellow polyvinyl chloride sheets having very good fastncss to migration and to light.

What we claim is:

l. Anthraquinone pigment of formula 1112 ll0 1t 0 NH-CO Br (III) l l l 

2. The pigment of claim 1 wherein R represents methoxy.
 3. The pigment of claim 1 wherein R represents chlorine.
 4. The pigment of claim 1 wherein R represents methyl. 